[pianotech] Key frame hold downs

[Al Guecia/AlliedPianoCraft]

 >With the reverse crowned key-frame, you've simply got to have enough force to bring the ends of the frame into contact with the bed>

That's my point William. If you have too much reverse crown or at too sharp an angle at the ends, Yes, it won't work.

Al G

  From: William Monroe 
  Sent: Thursday, August 13, 2009 6:09 PM
  To: pianotech at ptg.org 
  Subject: Re: [pianotech] Key frame hold downs


  All due respect, but no.  In my case, the frame was bedded well.  The clamps did not have enough force to bring the ends of the key frame into contact with the key bed.  That's just the way it was.  With the reverse crowned key-frame, you've simply got to have enough force to bring the ends of the frame into contact with the bed, and the clamps did not work well on the four pianos I tried them on.  As I said, YMMV and if you've found them to work for you, great.

  FWIW.

  William R. Monroe.




    William R. Monroe wrote:
    However, I personally don't recommend them, at least not for S&S ...... When I was in NY last spring, I tried a little experiment with them, and they did not ACCURATELY replicate the pressure of the cheek blocks - and this really is essential in S&S.

    If the key frame is bedded properly, they work great. If need to exert that much pressure with the key blocks, you can be sure the bedding is not right.

    Al G


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